vitamin c active substance is oxidized by air. Runchuyan Cleansing Cream is rich in vitamin C, which will slowly oxidize when exposed to air, and yellowing is the characteristic of vitamin C. Runchuyan is a brand of Guangzhou Xinrun Biotechnology Co., Ltd.. Adhering to the brand concept of "scientific management, precise repair", based on the skin data theory of 1 billion customers around the world, and integrating the international cutting-edge biotechnology, we focus on skin repair accurately.